/* Base Styles */
:root {
    /* Colors */
    --blue-primary: #1890FF;
    --blue-dark: #0050B3;
    --blue-light: #69C0FF;
    --blue-very-light: #E6F7FF;
    --white: #FFFFFF;
    --gray-light: #F0F2F5;
    --gray-medium: #8C8C8C;
    --gray-dark: #262626;
    --success: #52C41A;
    --error: #F5222D;
    --warning: #FAAD14;
    --info: #1890FF;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;

    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--gray-dark);
    background-color: var(--gray-light);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: 32px;
}

h2 {
    font-size: 24px;
}

h3 {
    font-size: 20px;
}

h4 {
    font-size: 16px;
}

a {
    text-decoration: none;
    color: var(--blue-primary);
}

ul {
    list-style: none;
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--white);
    border-right: 1px solid var(--gray-light);
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease;
}

.sidebar.collapsed {
    width: 80px;
}

.sidebar-header {
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--gray-light);
}

.logo {
    font-size: 24px;
    font-weight: 700;
}

.logo-text {
    color: var(--blue-primary);
}

.logo-z {
    position: relative;
}

.logo-z::after {
    content: "✓";
    position: absolute;
    font-size: 14px;
    top: -5px;
    right: -10px;
    color: var(--blue-primary);
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--gray-medium);
    cursor: pointer;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md) 0;
}

.sidebar-nav ul li {
    margin-bottom: var(--spacing-xs);
}

.sidebar-nav ul li a {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    color: var(--gray-dark);
    transition: all 0.2s ease;
}

.sidebar-nav ul li a:hover {
    background-color: var(--blue-very-light);
    color: var(--blue-primary);
}

.sidebar-nav ul li.active a {
    background-color: var(--blue-very-light);
    color: var(--blue-primary);
    border-left: 3px solid var(--blue-primary);
}

.sidebar-nav ul li a svg {
    margin-right: var(--spacing-md);
    color: var(--gray-medium);
}

.sidebar-nav ul li.active a svg,
.sidebar-nav ul li a:hover svg {
    color: var(--blue-primary);
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--gray-light);
}

.help-link {
    display: flex;
    align-items: center;
    color: var(--gray-medium);
}

.help-link svg {
    margin-right: var(--spacing-md);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s ease;
}

.main-content.expanded {
    margin-left: -180px;
}

/* Header */
.header {
    background-color: var(--white);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.search-bar {
    display: flex;
    align-items: center;
    background-color: var(--gray-light);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
}

.search-bar input {
    border: none;
    background: none;
    outline: none;
    margin-left: var(--spacing-sm);
    width: 200px;
}

.notifications {
    position: relative;
    cursor: pointer;
}

.badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background-color: var(--error);
    color: var(--white);
    font-size: 10px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-profile {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.user-profile img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: var(--spacing-sm);
}

/* Dashboard Content */
.dashboard-content {
    padding: var(--spacing-lg);
    flex: 1;
}

.welcome-section {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-md);
}

.welcome-text h2 {
    margin-bottom: var(--spacing-sm);
}

.welcome-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-md);
}

.price-icon {
    background-color: var(--blue-very-light);
    color: var(--blue-primary);
}

.alert-icon {
    background-color: #FFF2E8;
    color: var(--error);
}

.contract-icon {
    background-color: #F6FFED;
    color: var(--success);
}

.renewal-icon {
    background-color: #FFFBE6;
    color: var(--warning);
}

.stat-content h3 {
    font-size: 14px;
    color: var(--gray-medium);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.stat-change {
    font-size: 12px;
}

.positive {
    color: var(--success);
}

.negative {
    color: var(--error);
}

.neutral {
    color: var(--gray-medium);
}

.warning {
    color: var(--warning);
}

/* Charts Section */
.charts-section {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.chart-container {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.chart-actions select {
    padding: var(--spacing-sm);
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius-md);
    outline: none;
}

.chart-placeholder {
    height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--gray-light);
    border-radius: var(--border-radius-md);
}

/* Chart mockups for wireframe */
.chart-mockup {
    width: 100%;
    height: 80%;
    position: relative;
    padding: var(--spacing-md);
}

.chart-line {
    position: absolute;
    height: 2px;
    background-color: var(--blue-primary);
    opacity: 0.7;
}

.chart-line:nth-child(1) {
    width: 100%;
    top: 70%;
    left: 0;
}

.chart-line:nth-child(2) {
    width: 100%;
    top: 40%;
    left: 0;
}

.chart-line:nth-child(3) {
    width: 100%;
    top: 20%;
    left: 0;
}

.donut {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto;
    border-radius: 50%;
    background: conic-gradient(
        var(--blue-primary) 0% 60%,
        var(--success) 60% 85%,
        var(--warning) 85% 100%
    );
}

.donut-segment {
    position: absolute;
    width: 70px;
    height: 70px;
    top: 40px;
    left: 40px;
    border-radius: 50%;
    background-color: var(--white);
}

/* Recent Activity */
.recent-activity {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.activity-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    background-color: var(--gray-light);
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-md);
}

.price-alert {
    background-color: #FFF2E8;
    color: var(--error);
}

.contract {
    background-color: #F6FFED;
    color: var(--success);
}

.import {
    background-color: var(--blue-very-light);
    color: var(--blue-primary);
}

.activity-content {
    flex: 1;
}

.activity-content h4 {
    margin-bottom: var(--spacing-xs);
}

.activity-time {
    font-size: 12px;
    color: var(--gray-medium);
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background-color: var(--blue-primary);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--blue-dark);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--blue-primary);
    color: var(--blue-primary);
}

.btn-secondary:hover {
    background-color: var(--blue-very-light);
}

.btn-text {
    background-color: transparent;
    color: var(--blue-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
}

.btn-text:hover {
    background-color: var(--blue-very-light);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 12px;
}

/* Responsive */
@media (max-width: 992px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .charts-section {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 80px;
    }
    
    .sidebar-nav ul li a span,
    .help-link span,
    .logo-text {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .welcome-section {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .welcome-actions {
        margin-top: var(--spacing-md);
    }
}

@media (max-width: 576px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-right {
        margin-top: var(--spacing-md);
        width: 100%;
        justify-content: space-between;
    }
    
    .search-bar {
        width: 100%;
    }
    
    .search-bar input {
        width: 100%;
    }
}